Repair Effectiveness Studies on Impact Damaged Sandwich Composite Constructions

Raju, M and Reddy, CR and Narasimha Swamy, MR and Giridhar, G and Srikanth, L and Rajendra Prakash, M and Rao, RMVGK (2006) Repair Effectiveness Studies on Impact Damaged Sandwich Composite Constructions. Journal of Reinforced Plastics and Composites, 25 (1). ISSN 0731-6844

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Abstract

Experimental studies were carried out using sandwich composite panel specimens, consisting of both polyurethane foam core (PUF) and aramid honeycomb core (Nomex) type constructions. These specimens were subjected to impact damage at energy levels ranging between 7.56 and 15.6J. A ply-drop-patching technique was employed to repair the impact damaged sandwich specimens. The undamaged (virgin), impact damaged, and repaired specimens were then subjected to flexural (four point bending) and edgewise compression tests and strength recoveries were measured to determine the efficiency of the repair technique employed. In flexure, strength recoveries of upto 97% in PUF core and 90% in honeycomb core sandwich specimens were realized after repair, whereeas in compression, the corresponding values were upto 9O% in PUF core and 88% in honeycomb core sandwich specimens. A repair effectiveness factor(Ref)has been conceived and introduced to quantify the efficiency of the repair technique. Further, the repair quality was assessed using a simple NDT method prior to subjecting the sandwich specimens for destructive tests.

Item Type:	Article
Uncontrolled Keywords:	Sandwich, Impact damage, Composite repair, Repair efficiency
Subjects:	CHEMISTRY AND MATERIALS > Composite Materials
Depositing User:	Smt Bhagya Rekha KA
Date Deposited:	04 Jan 2012 04:29
Last Modified:	04 Jan 2012 04:29
URI:	http://nal-ir.nal.res.in/id/eprint/10169

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